<!-- yangbuyi Copyright (c) https://yby6.com 2023. -->

<template>
  <view class="u-row" ref="u-row" :style="[rowStyle]" @tap="clickHandler">
    <slot />
  </view>
</template>

<script>
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin("dom");
// #endif
import props from "./props.js";
/**
 * Row 栅格系统中的行
 * @description 通过基础的 12 分栏，迅速简便地创建布局
 * @tutorial https://www.uviewui.com/components/layout.html
 * @property {String | Number}	gutter		栅格间隔，左右各为此值的一半，单位px  (默认 0 )
 * @property {String}			justify		水平排列方式(微信小程序暂不支持) 可选值为`start`(或`flex-start`)、`end`(或`flex-end`)、`center`、`around`(或`space-around`)、`between`(或`space-between`)  (默认 'start' )
 * @property {String}			align		垂直排列方式 (默认 'center' )
 * @property {Object}			customStyle	定义需要用到的外部样式
 *
 * @event {Function} click row被点击
 * @example <u-row justify="space-between" customStyle="margin-bottom: 10px"></u-row>
 */
export default {
  name: "u-row",
  mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
  data() {
    return {};
  },
  computed: {
    uJustify() {
      if (this.justify == "end" || this.justify == "start")
        return "flex-" + this.justify;
      else if (this.justify == "around" || this.justify == "between")
        return "space-" + this.justify;
      else return this.justify;
    },
    uAlignItem() {
      if (this.align == "top") return "flex-start";
      if (this.align == "bottom") return "flex-end";
      else return this.align;
    },
    rowStyle() {
      const style = {
        alignItems: this.uAlignItem,
        justifyContent: this.uJustify,
      };
      // 通过给u-row左右两边的负外边距，消除u-col在有gutter时，第一个和最后一个元素的左内边距和右内边距造成的影响
      if (this.gutter) {
        style.marginLeft = uni.$u.addUnit(-Number(this.gutter) / 2);
        style.marginRight = uni.$u.addUnit(-Number(this.gutter) / 2);
      }
      return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle));
    },
  },
  methods: {
    clickHandler(e) {
      this.$emit("click");
    },
    async getComponentWidth() {
      // 延时一定时间，以确保节点渲染完成
      await uni.$u.sleep();
      return new Promise((resolve) => {
        // uView封装的获取节点的方法，详见文档
        // #ifndef APP-NVUE
        this.$uGetRect(".u-row").then((res) => {
          resolve(res.width);
        });
        // #endif
        // #ifdef APP-NVUE
        // nvue的dom模块用于获取节点
        dom.getComponentRect(this.$refs["u-row"], (res) => {
          resolve(res.size.width);
        });
        // #endif
      });
    },
  },
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/components.scss";

.u-row {
  @include flex;
}
</style>
